#GB_overlay {
  background-color:#333; 
  position: absolute;
  margin: auto;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100%;
  height:100%;
  opacity:0;
}

#GB_window {
  top: 30px;
  left: 0px;
  position: absolute;
  background: transparent;
  overflow: hidden;
  width: 400px;
  height: 400px;
  z-index: 150;
}

#GB_frame {
  border: 0;
  width: 100%;
  height: 378px;
}